/* ============================ 显示/隐藏控制 ============================*/
/* 移除不必要的元素 */
.tooltip,
#MathJax_Message,
#jb-print-docs-body h1,
hr.docutils,
#pst-back-to-top,
.dropdown-toggle,
.screen-only,
.no-print,
.ad-banner{
    display: none !important;
}